Here is my configuration. Exchange 2007 SP1 on Server 2003, migrated from Exchange 2003 early this year. 97% of clients are Outlook 2003 and Exchange Mode caching enabled. Other clients are Outlook 2007 and also Exchange Mode caching enabled. The bug weird: I create a new user in AD. All my clients are Outlook 2003 users in this new global address list them without problem. All my users who use Outlook Web Access also see this new user. All my clients Outloook 2007 does not see this new user. Now if I turn off the Cached Exchange Mode client 2007, the user will be seen in GAL. I deleted the file and reboot the Outlook.ost reactivated the cached Exchange mode and again, that user no longer appears. I found all my new user created in recent weeks does not appear on all Outlook 2007 clients that have Exchange Mode caching enabled. If you have any assumptions, suggestions or solutions then let me know. Thank you for your generous contribution.
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